Depo injection

Patient: I am 19yrs old and have in the past 2 months had the depo injection. this is my first and last time because it has been causing so many compercations due to having it. as soon as i had it i had after actions(side affects)from it but the main point iss im bleeding. i have been bleeding for 3 weeks straight now and woundering why this is? and when it will it will stop. it is causing intercourse problems between me and my new boyfriend as we can never have sex because i am 24 7 bleeding. the doctor said if i am still bleeding early dec (next week, she will do tests) what sort of tests?please could you try and help me.